Decreased kMaxOverusesBeforeApplyRampupDelay (from 7 to 4).
Increased kStandardRampUpDelayMs (30 to 40s).

BUG=1577
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/20129004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6886 4adac7df-926f-26a2-2b94-8c16560cd09d